MultimapEqualsTester.java revision 0888a09821a98ac0680fad765217302858e70fa4 
1/*
2 * Copyright (C) 2013 The Guava Authors
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
5 * in compliance with the License. You may obtain a copy of the License at
6 *
7 * http://www.apache.org/licenses/LICENSE-2.0
8 *
9 * Unless required by applicable law or agreed to in writing, software distributed under the License
10 * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
11 * or implied. See the License for the specific language governing permissions and limitations under
12 * the License.
13 */
14
15package com.google.common.collect.testing.google;
16
17import static com.google.common.collect.testing.features.CollectionSize.ZERO;
18import static com.google.common.collect.testing.features.MapFeature.ALLOWS_NULL_KEYS;
19import static com.google.common.collect.testing.features.MapFeature.ALLOWS_NULL_VALUES;
20
21import com.google.common.annotations.GwtCompatible;
22import com.google.common.collect.Multimap;
23import com.google.common.collect.testing.Helpers;
24import com.google.common.collect.testing.features.CollectionSize;
25import com.google.common.collect.testing.features.MapFeature;
26import com.google.common.testing.EqualsTester;
27
28import java.util.ArrayList;
29import java.util.List;
30import java.util.Map.Entry;
31
32/**
33 * Tester for {@code Multimap.equals}.
34 *
35 * @author Louis Wasserman
36 */
37@GwtCompatible
38public class MultimapEqualsTester<K, V> extends AbstractMultimapTester<K, V, Multimap<K, V>> {
39  public void testEqualsTrue() {
40    new EqualsTester()
41        .addEqualityGroup(multimap(), getSubjectGenerator().create(getSampleElements().toArray()))
42        .testEquals();
43  }
44
45  public void testEqualsFalse() {
46    List<Entry<K, V>> targetEntries = new ArrayList<Entry<K, V>>(getSampleElements());
47    targetEntries.add(Helpers.mapEntry(sampleKeys().e0, sampleValues().e3));
48    new EqualsTester()
49        .addEqualityGroup(multimap())
50        .addEqualityGroup(getSubjectGenerator().create(targetEntries.toArray()))
51        .testEquals();
52  }
53
54  @CollectionSize.Require(absent = ZERO)
55  @MapFeature.Require(ALLOWS_NULL_KEYS)
56  public void testEqualsMultimapWithNullKey() {
57    Multimap<K, V> original = multimap();
58    initMultimapWithNullKey();
59    Multimap<K, V> withNull = multimap();
60    new EqualsTester()
61        .addEqualityGroup(original)
62        .addEqualityGroup(withNull, getSubjectGenerator().create(createArrayWithNullKey()))
63        .testEquals();
64  }
65
66  @CollectionSize.Require(absent = ZERO)
67  @MapFeature.Require(ALLOWS_NULL_VALUES)
68  public void testEqualsMultimapWithNullValue() {
69    Multimap<K, V> original = multimap();
70    initMultimapWithNullValue();
71    Multimap<K, V> withNull = multimap();
72    new EqualsTester()
73        .addEqualityGroup(original)
74        .addEqualityGroup(withNull, getSubjectGenerator().create(createArrayWithNullValue()))
75        .testEquals();
76  }
77
78  @CollectionSize.Require(absent = ZERO)
79  public void testNotEqualsEmpty() {
80    new EqualsTester()
81        .addEqualityGroup(multimap())
82        .addEqualityGroup(getSubjectGenerator().create())
83        .testEquals();
84  }
85
86  public void testHashCodeMatchesAsMap() {
87    assertEquals(multimap().asMap().hashCode(), multimap().hashCode());
88  }
89}
90